Across
- 2. A collection of millions or billions of stars held together by gravity.
- 3. A point at which the kinetic energy of individual particles is zero
- 4. The total kinetic and potential energy of all the particles of an object. The higher the temperature of an object, the more thermal energy the object has
- 6. The expansion of matter when it is heated
- 10. How hot or cold something is; a measure of the average kinetic energy of the particles of a substance
- 12. The change in state that occurs when particles in a gas lose enough thermal energy to form a liquid
- 13. A statement that describes what scientists expect to happen every time under a particular set of conditions and is generally accepted as true.
- 15. Small, dense, and have rocky surfaces. They are often called the terrestrial planets
- 17. a well-tested explanation for a wide range of observations and experimental results. Can be changed or discarded as new information is collected
Down
- 1. There are 8 planets in our solar system that orbit the sun.
- 5. A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 10^12 km (nearly 6 trillion miles)
- 7. the region of the solar system between the orbits of Mars and Jupiter where many asteroids are found. Separates inner and outer planets
- 8. A state of matter that has no definite shape but has a definite volume
- 9. The change in state from a liquid to a solid. Kinetic energy is removed, particles slow down and vibrate in place
- 11. The measurement of how much mass of a substance is contained in a given volume. Represented by the formula Mass/Volume. Unit: (g/ml or g/cm³)
- 14. Earth has seasons because its axis is tilted as it revolves around the sun
- 16. An object that naturally revolves around any planet, like a satellite. Each planet varies in the number of moons it has